Wind and Structures

  • 제15권2호
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  • Pages.177-188
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  • 2012
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
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Meteorological events causing extreme winds in Brazil

  • Loredo-Souza, Acir M. (Laboratorio de Aerodinamica das Construcoes, Universidade Federal do Rio Grande do Sul)
  • 투고 : 2011.03.13
  • 심사 : 2011.08.20
  • 발행 : 2012.03.25
⟨ 이전 논문 다음 논문 ⟩

초록

The meteorological events that cause most strong winds in Brazil are extra-tropical cyclones, downbursts and tornadoes. However, one hurricane formed off the coastline of southern Brazil in 2005, a tropical storm formed in 2010 and there are predictions that others may form again. Events such as those described in the paper and which have occurred before 1987, generate data for the wind map presented in the Brazilian wind loading code NBR-6123. This wind map presents the reference wind speeds based on 3-second gust wind speed at 10 m height in open terrain, with 50-year return period, varying from 30 m/s (north half of country) to 50 m/s (extreme south). There is not a separation of the type of climatological event which generated each registered velocity. Therefore, a thunderstorm (TS), an extra-tropical pressure system (EPS) or even a tropical cyclone (TC) are treated the same and its resulting velocities absorbed without differentiation. Since the flow fields generated by each type of meteorological event may be distinct, the indiscriminate combination of the highest wind velocities with aerodynamic coefficients from boundary layer wind tunnels may lead to erroneous loading in buildings.

키워드

참고문헌

  1. Associacao Brasileira de Normas Tecnicas (1988), Norma Brasileira NBR-6123 (NB-599): Forcas devidas ao vento em edificacopes, ABNT, Rio de Janeiro.
  2. Blessmann, J. (2001), Accidents caused by the wind (in Portuguese), 4th Ed., Universidade/UFRGS. Porto Alegre.
  3. Cermak J.E. (1998), "Wind damage mitigation-Wind engineering challenges", Proceedings of the Wind Effects on Buildings and Structures, Balkema, Rotterdam.
  4. Davenport A.G. (1998), "What makes a structure wind sensitive?", Proceedings of the Wind Effects on Buildings and Structures, Balkema, Rotterdam.
  5. Fujita, T.T. (1985), The Downburst: Microburst and Macroburst, Paper No. 210, Satellite and Mesometeorology Research Project, Department of Geophysical Sciences, The University of Chicago, Chicago, IL.
  6. Fujita, T.T., and Wakimoto, R.M. (1981), "Five scales of airflow associated with a series of downbursts on 16 July 1980", Mon. Weather. Rev., 109, 1438-1456. https://doi.org/10.1175/1520-0493(1981)109<1438:FSOAAW>2.0.CO;2
  7. Hackbart, E. (2007), Boletim da MetSul Meteorologia. Sao Leopoldo, May 4.
  8. Hackbart, E. (2010), Boletim da MetSul Meteorologia. Sao Leopoldo, March 9.
  9. Hackbart, E. (2010), Boletim da MetSul Meteorologia. Sao Leopoldo, July 21.
  10. Loredo-Souza, A.M. and Paluch, M.J. (2005), "Brazil storm Catarina: hurricane or extratropical cyclone?", Proceedings of the10th Americas Conference on Wind Engineering, Baton Rouge, Louisiana, U.S.A., 31 May-4 June.
  11. McCurdy, A.J. (1923), "Cyclonic disturbances in the South Atlantic Ocean", Mon. Weather. Rev., 595.
  12. Nascimento, E. (2010), The severe weather episode of Canela, RS in July 21, 2010, Technical Report # 01/ 2010, Centro Estadual de Ensino e Pesquisa em Desastres no Rio Grande do Sul - CEPEDRS (in Portuguese).
  13. Riera J.D. and Rocha, M.M. (1998), "Load definition for wind design and reliability assessments: Extreme wind climate", Proceedings of the Wind Effects on Buildings and Structures, Gramado, Brazil, Balkema, Rotterdam.

피인용 문헌

  1. Investigations on coefficient of variation of extreme wind speed vol.18, pp.6, 2014, https://doi.org/10.12989/was.2014.18.6.633
  2. Brazil and Argentina Joint Program in Wind Engineering vol.41, pp.4, 2016, https://doi.org/10.5359/jawe.41.331
  3. Downburst related damages in Brazilian buildings: Are they avoidable? vol.185, pp.None, 2019, https://doi.org/10.1016/j.jweia.2018.11.022
  4. Aerodynamic effects on a high slenderness concrete chimney vol.12, pp.6, 2019, https://doi.org/10.1590/s1983-41952019000600008